Page 1
Letex Technology Corp.
Subminiature Photointerrupter
Model No: LBT-124
Features
˙Compact package based on the double-mold method.
˙High resolution (slit width = 0.4mm).
˙Gap between emitter and detector is 2.0mm.
Applications
˙Floppy disk drives
˙Printers
˙Cameras
Outline Dimensions (Unit: mm)
4 3
1 2
1 Anode
2 Cathode
3 Emitter
4 Collector
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Letex Technology Corp.
Absolute Maximum Ratings (Ambient Temperature: 25℃)
V eco
Storage Temperature
Tstg
Operating Temperature
Soldering Temperature
BV eco
Tr/tf
Input
Output
Electrical Specifications (Ambient Temperature: 25℃)
Forward voltage VF 1.2 1.4 V
Input
Output
Combi
nation
Peak forward voltage VFM 3 4 V
Reverse current IR 10 µA
Collector dark current Iceo 0.5 µA
Collector-emitter breakdown voltage BVceo 30 V
Emitter-collector breakdown voltage
Collector current Ic 0.5 mA
Collector-emitter saturation voltage Vce(sat) 0.4 V
Response time
Subminiature Photointerrupter
Model No: LBT-124
Item Symbol Rating Units Note
Forward current IF 50
Reverse voltage VR 5
Power dissipation PD 75
Collector-emitter voltage Vceo 30
Emitter-collector voltage
Collector power dissipation PC 80
Top -25 to +85
Tsol 260
Item Symbol Min. Typ. Max. Units Conditions
4.5
-40 to +100
4.5 V
mA
V
mW
V
mA
mW
℃
℃
℃
10 µs
10 seconds max.
IF=20mA
IFM=0.5A
VR=5V
Vce=10V
Ice=50µA
Iec=50µA
Vce=5V, IF=20mA
IF=20mA, Ic=0.3A
IF=5mA, Vcc=5V,
RL=100Ω
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Page 3
Letex Technology Corp.
Subminiature Photointerrupter
Reference Data
Relative collector current (
C-E Saturation voltage (V)
Shield distance (mm)
Power dissipation (mW)
Forward current Vs.
Ambient temperature
60
50
40
30
20
Forward current (mA)
10
0
-30
0 25 50 75 100 125
Ambient temperature (℃)
Forward current Vs.
Forward voltage
500
200
100
50
20
10
Forward current (mA)
5
2
1
Ta = 75℃
50℃
0
0.5 1.0 1.5 2.0 2.5 3.0
Forward voltage (V)
Peak forward current Vs.
Duty ratio
100
80
60
40
20
0
-25 0
25 50 75 100
Ambient temperature (℃)
25℃
0℃
25℃
Collector current Vs.
Forward current
12
Vce = 5V
Ta = 25℃
10
8
6
4
Collector current (mA)
2
0
0 10
Forward current (mA)
30
20 40
125
50
2000
1000
500
200
100
50
Peak forward current (mA)
20
10
Collector current Vs.
Collector-Emitter voltage
12
Ta = 25℃
10
8
6
4
Collector current (mA)
2
0
-2
-3
10
10 5
2 5
2 10 5 5 2 10
Duty ratio
50mA
30mA
20mA
IF=10mA
1 0 3 2 4
Collector-Emitter voltage (V)
Pulse width 100us
Ta = 25℃
-1
40mA
6 5 7 9 8 10
0
Collector current Vs.
Ambient temperature
8
7
6
5
4
3
Collector current (uA)
2
1
0
-25
Ambient temperature (℃)
C-E Saturation voltage Vs.
Ambient temperature
0.30
0.25
0.20
0.15
0.10
0.05
0
-25
0 25 50 75 100
IF = 20mA
Vce = 5V
25 0 75 50 100
Ambient temperature (℃)
IF = 40mA
Ic=1mA
Response time Vs.
Load resistance
500
Vce = 2V
200
Ic = 2mA
Ta = 25℃
100
50
20
10
5
2
Response time (μs)
1
0.5
0.2
0.1
100
80
%)
60
40
20
0
tf
tr
td
ts
0.2
0.03
0.05 0.1
Load resistance (kΩ )
Relative collector current Vs.
Shield distance
-2 0 -1
2 10.5 10 5
-2 2 1 0 -1 1
IF = 20mA
Vce = 5V
Ta=25°
Collector dark current Vs.
Ambient temperature
-5
10
-6
10
-7
10
-8
10
-9
10
Collector dark current (A)
-10
10
-11
10
-25
0
Ambient temperature (℃)
Vce = 20V
25
50 100 75
Test circuit for resopnse time
Vcc
RD
Input
2
Input
RL
Output
Output
10%
90%
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